well I've rebuilt my carb now with no change. I checked all the surfaces for deformaties everything looks nice and straight. I used hi tack sealant on all the joints between the engine and the carb and it's running exactly the same. I'm still waiting on an exact header length before I cut mine shorter. I noticed on 3W's site that they measure from the beginning of the header where it bolts to the engine to the end of the header at the coupler. They don't have specs for the 106 anymore but for the 110 the length is 6.69 - 8.26 inches. I'm sure that it's probably similar I'm just waiting to find out.